Samson 430 Series, Mounting And Operating Instructions

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12 EB 7030 EN
Start-up and settings
If a P/PI controller is switched to P action,
completely open the Tn restrictor to ensure
the operating point adjuster can take effect
without delay.
Version with set-point-dependent operating
point
This version does not need to be adjusted
since the operating point automatically fol
-
lows the set point w.
4.3 Bumpless automatic/
manual mode changeover
The bumpless switchover ensures that no
pressure surges can reach the valve when
the manual/automatic switch is activated as
follows:
Changeover from automatic to manual
Use the adjuster (1.7) to adjust the manual
output y
H
until the differential pressure indi -
cator (1.8) reads zero. Change the switch
over to manual.
Differential pressure indicator
With Without deviation
Changeover from manual to automatic
If the system is to be controlled manually to
the required value, the automatic output y
A
must be adjusted at the set point adjuster
(1.4) to match the manual output y
H
.
Do not set the switch (1.6) to automatic until
the differential pressure indicator (1.8) reads
zero.
Afterwards, adjust the set point again to the
required value.
4.4 Bumpless changeover be-
tween internal or external
set point
For fixed set point and follow-up control
modes, the Type 3432 Controller Station is
fitted with a w
int
/w
ext
selector switch, a pres -
sure adjuster and a differential pressure indi -
cator (Fig. 12).
For bumpless changeover betwen set points,
adjust the the pressure adjuster until the dif
-
ferential pressure indicator moves to zero.
4.5 Recalibrating the controller
zero point
If deviations arise between the controlled
variable and set point during operation, the
zero point can be recalibrated by turning the
zero screw on the back of the indicating unit
(5) until the controlled variable and set point
on the front display are the same again.
Deviations between the set point and the
controlled variable can also be corrected at
the zero adjuster (8, Fig. 1) of the controller
module.
Note